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Yuki888 [10]
3 years ago
13

I need help with both questions

Chemistry
1 answer:
a_sh-v [17]3 years ago
6 0

Answer:

not sure about 6 but 7 should be c

Explanation:

..

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Explain the relationship between the following terms: eutrophication, nutrients, dissolved oxygen leads, and algae.
makvit [3.9K]

Answer:

Eutrophication is the enrichment of a body of water with excessive nutrients (nitrogen and phosphorus), which causes algal growth and subsequent decline of dissolved oxygen after decomposition.

6 0
3 years ago
A solid is cooled to a very low temperature assuming the mass remains constant how if at all does this affect the density of the
vekshin1
Temperature is related to the kinetic energy the atoms within any given substance. Within a solid, we can therefore assume that the density will increase as the solid is cooled to a low temperature, as this will cause a loss in kinetic energy and the atoms won't be able to move as freely.
8 0
3 years ago
Barium oxalate is used as a colorant to produce the green color in fireworks. Imagine that you have been assigned to prepare bar
JulsSmile [24]

Answer:

2.1

Explanation:

Calculation of moles of Ba(OH)_2.8H_2O

Mass of copper = 5.3 g

Molar mass of copper = 315.46 g/mol

The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

Thus,

Moles= \frac{5.3\ g}{315.46\ g/mol}

Moles of Ba(OH)_2.8H_2O = 0.0168 moles

According to the reaction,

Ba(OH)_2.8H_2O + H_2C_2O_4.2H_2O\rightarrow BaC_2O_4 + 12 H_2O

1 mole of Ba(OH)_2.8H_2O react with 1 mole of  H_2C_2O_4.2H_2O

0.0168 moles of Ba(OH)_2.8H_2O react with 0.0168 moles of  H_2C_2O_4.2H_2O

Moles of H_2C_2O_4.2H_2O = 0.0168 moles

Molar mass of H_2C_2O_4.2H_2O = 126.07 g/mol

Thus,

<u>Mass = Moles * Molar mass = 0.0168 moles * 126.07 g/mol = 2.1 g</u>

<u>Answer - 2.1</u>

5 0
3 years ago
Which of the following groups of elements have no electronegativity?
natulia [17]

Answer: Noble gases

Explanation:

Electronegativity is the ability of an atom to gain an electron. Noble gases already have 8 electrons, so they don’t need to gain electrons. If they don’t gain electrons, it has no electronegativity.

6 0
2 years ago
Light has a wavelength of 34.4 nm. What is its frequency?
pishuonlain [190]
<h2>Answer:    8.69 × 10⁻¹ Hz </h2>

<h3>Explanation: </h3>

Frequency = Speed of Light ÷ Wavelength

                    = (2.99 × 10⁸ m/s) ÷ (3.44 × 10⁻⁸ m)  

                    = 8.69 × 10⁻¹ Hz

The frequency of a light of wavelength 34.4 nm is 8.69 × 10⁻¹ Hz.

<u>Notes:</u>

Hz ≡ /s

1 m = 10⁹ nm

8 0
3 years ago
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